The periodic table got its name from the way the elements are arranged in rows, which are called periods. The columns of the table are called groups, some of which have specific names, such as the noble gases and the hal... More »

The periodic table's name comes from the fact that it arranges the elements into repeating sets, otherwise known as "periods." These periods are defined by the covalence of an element, the number of electrons it has in i... More »

The periodic table is useful because it identifies and arranges all known elements in an informative manner. Elements are arranged into periods and families. The elements in each family or period may have similar or diss... More »

Dmitri Mendeleev's periodic table featured elements arranged in accordance with their atomic mass, while the modern table has elements arranged according to periodic number. Mendeleev's periodic table also had the elemen... More »

The horizontal rows on the periodic table of the elements are called periods. Every element in a period has the same number of atomic orbitals. For instance, hydrogen and helium are in the first period, so they both have... More »

The periodic table's name comes from the fact that it arranges the elements into repeating sets, otherwise known as "periods." These periods are defined by the covalence of an element, the number of electrons it has in i... More »

In the periodic table, elements in the same group or family have similar chemical properties because they have the same number of valence electrons in their outer shells. When the group numbers on the periodic table are ... More »